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单词 Length
释义

length


The length of a line segmentMathworldPlanetmath is the distance between its endpoints. Length may be measured in meters, yards, abstract units, etc. For example, in the following diagram

0133.24ABCDE..

AB is one unit long, BC is two units long, CD is a fifth of a unit, DE is four fifths of a unit, AC is three units, etc.

The concept of length as defined above is a special case of a general concept called measure.

In two-dimensional space, length usually goes along the x axis while height goes along the y axis. The same holds in three-dimensional space.

For trianglesMathworldPlanetmath, pentagonsMathworldPlanetmath, and higher n-gons (http://planetmath.org/BasicPolygon), it is customary to refer to the length of any of its sides as the length of the . The length of a circle’s side is called its circumferenceMathworldPlanetmath.

In set theoryMathworldPlanetmath, length refers to the number of elements a set (or one-dimensional array) has. This is also known as cardinality. For example, {2,5,11,23,47} has length 5.

Titlelength
Canonical nameLength
Date of creation2013-03-22 16:31:45
Last modified on2013-03-22 16:31:45
OwnerPrimeFan (13766)
Last modified byPrimeFan (13766)
Numerical id17
AuthorPrimeFan (13766)
Entry typeDefinition
Classificationmsc 51D20
Classificationmsc 51-00
Classificationmsc 51M25
Related topicArea2
Related topicVolume2
Related topicBasicPolygon
Defineslength of a polygonMathworldPlanetmathPlanetmath
Defineslength of a set
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